Why fix it? You can figure out when to change your oil either by watching
the trip counter (after it turns over to all 0's 3 times, it is time to
change the oil) or after every 8 fillups or so. Seems like a waste of money
to me. And even if you do change it, you will have a warning on the title
that the odometer did not work.
Jeff

In at least some places, you can set a replacement odometer to be the
same as the failed one without having to deal with stickers, title
warnings, etc. that you would have to deal with when selling the car
if the odometer does not work, or is replaced with an odometer with
zero or otherwise different mileage.
It is also more convenient to measure mileage for maintenance purposes
with the regular odometer than trying to remember how many times the
trip odometer turned over (unless you drive little enough that you do
maintenance by time intervals).

Are you getting the odometer and the trip counter confused? The odometer
IS the total milage counter which looks like this: 19988.9 or 199988.9. The
trip counter IS the one that goes up to 999.9 miles. You need to go to a
Ford dealer and have your speedometer, odometer and trip counter checked. It
may need to be replaced.
~CyberWolf

Maybe I didn't explain the problem right.
It is a 1990 Grand Marquis, 5.0 EFI. The speedometer, odometer and
trip counter are all anolog with moving parts for the digits. It is
the odometer that has stopped working. The speedometer and trip
counter work fine.

It is analog, but the parts are not cable driven. The speedometer works like a
tachometer. Both the odometer and trip meter runs off a little motor. I believe
89 was the last year for the cable driven speedometer.
wrote:

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